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Mediterranean purple sea urchin - Sphaerechinus granularis

Purple Sea Urchin Close Up Underwater Southeast Alaska

Single purple sea urchin in the middle of coral reef tank in an aquarium

Sea Urchins, California. Strongylocentrotus purpuratus

A Long Spined Sea Urchin (Centrostephanus longispinus) in the Mediterranean Sea

Sea Urchin Echinoderm Underwater Sea life, Macro abstract background. sea urchin spines and teeth

Sea urchin Evechinus chloroticus on rock covered with layer of sediment and some vegetation.

The stone covered harbour floor, Kolocep Island, Croatia.

Spiny black sea urchin (Diadema setosum) grazing on algae in tropical coral reefs. Vital for reef ecosystem balance.

Paracentrotus lividus is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean

Sea Urchin on Rock Near Ocean Background

Sea Urchin Echinoderm shell texture. Underwater Sea life, Macro abstract background.

Sea urchin under water on white sand over Zanzibar, Tanzania coast, in the Indian Ocean

Serene underwater environment surrounding Boracay Island, located in the Philippines. The image showcases a stone coral formation with a black urchin resting upon it. The black urchin is characterized by long, slender needles. The underwater scene features clear blue water with visible sunrays, adding a touch of natural illumination to the photograph.

A vibrant sea urchin clings to a rock under the water’s surface.

Black Long Spines Sea Urchin (Diadema Setosum) Invertebrate Marine Life

Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.

Centrostephanus longispinus, the hatpin urchin, is a species of sea urchin in the family Diadematidae. There are two subspecies, Centrostephanus l. longispinus, found in the eastern Atlantic and Mediterranean Sea and Centrostephanus l. rubricingulus, found in the western Atlantic.

Sea urchin needles sharp poisonous dangerous sucker feet tentacles and mouthparts close up organism movement.

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \n\nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is, a lot of people think the thing in the middle is the eyeball, but the rectum. \n\nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \n\nLembeh Strait, Indonesia \n1°28'56.394 N 125°15'15.588 E at 8m depth$

Rock boring urchin, Echinometra mathaei, nestled in a crevise of a tide pool. The urchin uses it jaws to enlarge the hole as it grows. Ko Olina, Oahu, Hawaii.

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